Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
toc sach » hoc sach, doc sach, nuoc sach
van cham » van chat, van tham, va cham
cham tuc » nham thuc, pham thuc, tham thuc
xa dinh » xac dinh, va dinh, ba dinh
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuoc sach)) ky nang x hoi. thien van cham tuc xa dinh ((day cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky nang x hoi. thien van cham tuc xa dinh ((day cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuoc sach)) ky nang x hoi. thien van cham tuc xa dinh ((day cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) ky nang x hoi. thien van cham tuc xa dinh ((day cua) OR (dai cua)) tre*.